DocumentCode
784143
Title
Constant-Ratio Code and Automatic-RQ on Transoceanic HF Radio Services
Author
Moore, John B.
Author_Institution
RCA Communications, Inc., New York, NY, USA
Volume
8
Issue
1
fYear
1960
fDate
3/1/1960 12:00:00 AM
Firstpage
72
Lastpage
75
Abstract
Historical development, of present-day commercial teleprinter services, is briefly tabulated according to dates of significant advances. The 7-unit form of basic constant-ratio code is given, and its advantages explained; indicative values of improvement are tabulated. A general description of the Automatic-RQ method and system-rather than specific designs-is given. Commercial application and growth, in the international services, is illustrated by that of TEX (Overseas Teleprinter Exchange) service. Improvement in error probability and reliability, by use of 7-unit ARQ on such services, is given in terms of character-transposition probability, net channel speed in words per minute, and practical operating experience.
Keywords
Automatic repeat request; Circuit noise; Circuit testing; Error probability; Fading; Feedback; Hafnium; Protection; Telegraphy; Teleprinting;
fLanguage
English
Journal_Title
Communications Systems, IRE Transactions on
Publisher
ieee
ISSN
0096-2244
Type
jour
DOI
10.1109/TCOM.1960.1097598
Filename
1097598
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